Ladder-jack.



No. 683,8!2. Patented Oct. I90I.

0. W. TAMM.

LADDER -.|A6K. :Appnmxg'gnled'my 9, 1901.) (No Model.) I 2 Sheets-SheetL Strom/WW,

o. w. TAM. LADDER JACK.

(Application led July 9, 1901.]

Patented Det. I, `590|.

(No Model.)

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rUNITED STATES FATENT OSCAR XV. TAMM, OF SANDUSKY, OHIO.

LADDER-JAC K.

SPECIFICATION forming part of Letters Patent N o. 683,812, dated October 1, 1901.

Application tiled July 9, 1901.

T0 all whom it may concern.-

Beit known that I, OSCAR W. TAMM, a citizen of the United States, residing at Sandusky, in the county of Erie and State of Ohio, have invented new and useful Improvements in Ladder-Jacks, of which the following is a specification.

My invention relates to ladder-jacks; and the object of the same is to construct a device which can be attached to the side of a ladder to serve as a iirm support for staging, paintpots, fruit-baskets, dac., and at the same time be simple in construct-ion and efficient in operation.

M y novel construction is fully described in this specication, and claimed and illustrated in the accompanying drawings, forming a part thereof, in which- Figure 1 is a side elevation of a fragment of a ladder equipped with my jack. Fig. 2 is a perspective of my jack. Fig. 3 is a detail of the horizontal arm. Fig. 4 is a detail of the upper bracket-arm. Fig. 5 is a detail of the lower bracket-arm.

Like numerals of reference designate like parts in the different views of the drawings.

The numeral 1 designatesaladder of the ordinary leaning type set at angle to the vertical and having sides 2 and rounds 3. My device attached thereto comprises three principal membersa horizontal arm 4, an upper bracket-arm 5, and a lower bracket-arm 6', which arms will be taken up and described in the order named and their relations stated.

The horizontal arm 4 consists of two members 4a and 4b, a long and a shorter, respectively, secured together. To provide means for attaching` the arm 4 to the ladder 1 a clamp is mounted in the other end thereof, which clamp comprises a claw 7 and a sheave 8, connected by gears. The claw 7 is mounted in a slot 9 in the outer end of the member 4it and is pivoted on a pin 10, extending transversely the slot. The outer end 11 of the claw is hooked and designed to embrace a side bar of the ladder. Teeth 12 are formed on the inner face of the hook to keep it from slipping. `An elongated point 13 serves as a handle for use in disengaging the claw 7 from the ladder. The inner end of the claw has formed integral therewith a cogged sector 14, having its center coincident with the cenf- Serial No. 67,629. (No model.)

ter of the pivotpin 10. This sector 14 is constructed to mesh with a small gear 15, mounted in the slot 9 and which meshes in turn with a smaller gear 16, which meshes wit-h a still smaller gear 17, keyed on the shaft 18 cf the sheave 8. The sheave Sis keyed on the shaft 18 and bears a series of pins or teeth 19 for engaging the side 2 of the ladder 1 to hold the sheave 8 from turning thereby the gears and secure the claw 7.

The upper bracket-arm 5 is pivoted to the upper end of a vertical standard 20, bolted to the outer end of the arm 4. The arm 5 consists of two members 5a and 5b. The members 5a bear a rectangular hook 21, designed to catch a side 2 of the ladder 1. The' shank 22 of the hook 21 is cut by a T-shaped groove 23, forming guides 24, between which the member 5b is mounted to slide. The member 5b bears a series of ratchet-teeth which are normally engaged by a spring-dog 25, mounted on the member 5a. The dog 25 has a thumb-piece 25a for use in disengaging it from the teeth. By this arrangement the arm 5 can be adjusted in length to correspond to different inclinations of the ladder.

The lower bracket-arm 6 is pivoted to the 1 In operation the ladder is first placed in thel desired position and the jack then carried up to the proper height and the member 4 set horizontally, with the claw 7 engaging one side 2 of the ladder. This claw is then grasped and pulled toward the ladder and the sheave 8 pressed toward it, which action will actuate the gear and permit the claw to swing, and the sheave 8 will be brought in contact with the side 2, with the teeth thereon engaging therewith. The sheave 8 is then held securely against turning and the claw 7 held from slacking off its hold. The pawl 25 is then disengaged from the ratchet 22, the hook 21 caught on the side 2 above one of the rounds 3, and the pawl 25 engaged in the ratchet 22, with the arm 4 extending horizontally. The

IOO

arm 6 is then attached to the ladderin a similar manner below a round 3, and the jack is then firmly secured in place. The stagingplank can now be rested on the arm 4. It should be noted that the heavier the weight the firmer will be the grip of the device on the ladder.

I do not wish to be limited as to details of construction, as these may be modified in many particulars Without departing from the spirit of my invention.

Havingv described my invention, what I claim as new, and Wish to secure by Letters Patent, is-

1. In a device of the class described, the combination of a horizontal arm having on its inner end a clamp constructed to engage one side of a ladder, an upper bracket-arm pivoted to the outer end of said horizontal arm, and bearing a hook constructed to engage the ladder, and a lower bracket-arm pivoted to the outer end of said horizontal arm and bearinga hook constructed to engage said ladder, substantially asdescribed. c

2. In a device of the class described',a clamp comprising'the combination With an arm, of a hooked claw bearing a cogged sector, and constructed to engage the side of a ladder, a gear meshing with said sector, a tooth-bearing sheave keyed on a shaft, and a gear keyed on said shaft and meshing with said gear, substantially as described.

esasl 3. In a device of the class described, a bracket-arm comprising the combination of a first member having parallel guides, a second member bearing a ratchet and a rectangular hook constructed to engage one side of a ladder, and a pawl mounted on said first member and located to normally engage said ratchet, substantially as described.

4. In a device of the class described, the combination of a horizontal arm, a pivoted claw on one end of said arm, a toothed sheav'e journaled in said arm, and means for connecting said claw and said sheave and arranged so that the claw will be held against turning by reason ot' the sheave being held against turning, substantially as described.

5. In a device of the class described, the combination of a horizontal arm, a pivoted claw bearing a sector, a gearv meshing with said sector, a gear keyed on a shaft and meshing with said gear, a sheave provided with teeth and keyed on said shaft, an upper bracket-arm bearing a hook, and a lower bracket-arm bearing a hook, substantially as described.

In testimony whereof I have hereunto set my hand in presence-of two subscribing Witnesses.

OSCAR W. TAMM.

Vitnesses:

AUGUST W. TAMM, HARRIET M. TAMM. 

